News tagged with eye

Related topics: brain , nerve cells , current biology , retina

Spotting eye problems in pets

Pets don't have to read an eye chart to keep a driver's license or don prescription glasses to see the tiny text on a smartphone. But they still need eye care. In fact, animals experience many of the same ...

Oct 13, 2014
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Eye

Eyes are organs that detect light, and send signals along the optic nerve to the visual and other areas of the brain[citation needed]. Complex optical systems with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image-resolving eyes are present in cnidaria, molluscs, chordates, annelids and arthropods.

The simplest "eyes", such as those in unicellular organisms, do nothing but detect whether the surroundings are light or dark, which is sufficient for the entrainment of circadian rhythms. From more complex eyes, retinal photosensitive ganglion cells send signals along the retinohypothalamic tract to the suprachiasmatic nuclei to effect circadian adjustment.

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